Special flux-cored wire for carrying out preheating-free and heat treatment-free surfacing repair and reproducing on shaft and gear parts

Abstract

The invention belongs to the field of material science and engineering and relates to a special flux-cored wire for carrying out preheating-free and heat treatment-free surfacing repair and reproducing on shaft and gear parts. The special flux-cored wire comprises the following chemical compositions in percentage by weight: 5 to 10 percent of fluorite, 20 to 40 percent of high-carbon ferrochrome, 5 to 10 percent of high carbon ferromanganese, 5 to 10 percent of ferrosilicon, 5 to 10 percent of ferromolybdenum, 10 to 15 percent of rare earth oxide, 15 to 20 percent of metallic nickel, 2 to 5 percent of ferrovanadium, 2 to 5 percent of ferrocolumbium, 2 to 5 percent of ferrotitanium, 0.1 to 0.5 percent of graphite, 5 to 15 percent of iron powder, 0.5 to 2 percent of nitride and 1 to 3 percent of aluminum magnesium alloy. A sheath of the special flux-cored wire is a low-carbon steel strip. The special flux-cored wire can be suitable for open arc welding or submerged arc welding. The series flux-core wire for surfacing can carry out surfacing repair and reproducing on the shaft and gear parts under the conditions that preheating is free before surfacing and heat treatment is free after surfacing. The surfacing metal has high crack resistance. The performance of the repaired parts is equal to or even superior to that of the original parts. The special flux-cored wire is convenient to use on site. The hardness range is between HRC20 and HRC45. The service life of the repaired parts is about 3 times longer than that of the original parts.

Description

technical field [0001] The invention belongs to the field of material science and engineering, and in particular relates to a special flux-cored welding wire used for overlay welding repair and remanufacturing of shaft gear parts without preheating and heat treatment. Background technique [0002] Shafts and gear parts are commonly used parts in industrial production, not only consume a lot of money and are expensive, but also the quality of their materials directly affects the production efficiency of machines and equipment. [0003] The working conditions of shafts and gear parts are more complicated. It is subjected to mechanical load and friction load during work, and fails due to mechanical fatigue and excessive wear. Although people are looking for various ways (such as heat treatment, microalloying, surface carburizing, nitriding, carbonitriding, etc.) And excessive wear, these parts will eventually be scrapped. [0004] Remanufacturing technology is to use origina...

AI Technical Summary

Problems solved by technology

The overall manufacturing of shafts and gear parts is not only expensive, but also because the working